Data from three instances

I have view that is same in all the three instances. I want to be able to pull data from all the three instances into the same subject area. Basically do a UNION of all the data. Here are the issues:
1. Physical layer, i created three connection pools and dragged the views (they are all named sample_view) in. I am trying to do a join, but by default i am only able to do 1 to N relationship only. I went ahead created it.
2. BMM layer, i created a new LTS to pull the views from other connection pools. But i dont want to do a join, which will pop up an error/warning if i dont.
This may not be the best way, but i was giving it a try in OBIEE before i ask my DBA to create a view with all data from all three instances in the same one. Please advise if anyone has experienced this situation before.
Thx!

Why don't you use fragmentation?
http://108obiee.blogspot.com/2009/01/fragmentation-in-obiee.html
If you need similar to UNION why do you need join?
Explain a little bit more please..
Regards
Nicolae

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Message was edited by:
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Hi
Thanks to all for the reply..
I am using Oracle 10g
Version:
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28     1266     United States
381     381     United States
610     1873     United States
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Alfred     [email protected]     Perficient Inc.     United States
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